The Precise Radius of the Inner Core Was Not Measured
The precise radius of the inner core was not measured until relatively recently.How was this accomplished?
A)by finding the S-wave shadow zone beyond 105°
B)by Neil Armstrong conducting hammer seismic experiments during a 1960's Apollo Mission
C)by using a precisely known, underground nuclear weapons test in the Nevada desert in the early 1960s
D)by measuring the edge of the P-wave shadow zone from the great Chilean earthquake of 1960